At least 30 people were killed and 150 injured on May 22 when suicide bomber blew himself up at the Imam Ali mosque in the village in Saudi Arabia

A week later, a man disguised as a woman blew himself up -- killing three people -- outside a mosque in a predominantly Shiite neighborhood of Damman, the capital of Saudi Arabia's oil-rich Eastern Province.

Saudi Arabia has launched numerous airstrikes in Yemen this year in support of that country's deposed president.